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3 years ago

10

Separates substances based on their movement through a special paper

1 answer:

Rama09 [41]3 years ago

4 0

This sounds like paper chromatography. Let me know in the comments if the answer is something else.

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In an endothermic reaction, always treat heat as a

BARSIC [14]

And an endothermic reaction, always treat heat as a reactant

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2 years ago

When two protons and two neutrons combine to form 4He, it is found that this helium nucleus is less massive than the sum of the

Fynjy0 [20]

Answer:

Explanation:

This signifies a defect in mass. The phenomenon is known as mass defect. Mass defect is compares the mass of an isotope to that of the nucleons in the nucleus.

The mass defect implies the energy that was given off when the protons and neutrons combine to form the new helium atom. The mass defect helps us to understand why the mass of an atom might not eventually correspond to what we obtain theoretically by calculation.

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3 years ago

An AM station broadcasts at 1290 kHz. <br> Calculate the wavelength of this radio frequency.

Dahasolnce [82]

Answer:

$Wavelength=232.56\ m$

Explanation:

The relation between frequency and wavelength is shown below as:

$c=frequency\times Wavelength$

c is the speed of light having value $3\times 10^8\ m/s$

Given, Frequency = 1290 kHz = $1290\times 10^{3}\ Hz$ (As 1 kHz = 1000 Hz )

Thus, Wavelength is:

$Wavelength=\frac{c}{Frequency}$

$Wavelength=\frac{3\times 10^8}{1290\times 10^{3}}\ m$

$Wavelength=232.56\ m$

4 0

3 years ago

How does the size of a nucleus compare to the amount of space that electrons have to orbit around it

Liono4ka [1.6K]

Here's an answer from yahoo

8 0

3 years ago

A chemical engineer must calculate the maximum safe operating temperature of a high-pressure gas reaction vessel. The vessel is

Andre45 [30]

Answer:

525°C is the maximum safe operating temperature the engineer should recommend for this reaction.

Explanation:

Volume of the cylindrical container = V = $\pi r^2h$

Height of the vessel = h =60.0 cm

Diameter of the vessel = d = 50.0 cm

Radius of the vessel = r = 0.5d = 25.0 cm

$V=3.14\times (25.0 cm)^2\times 60.0 cm=117,809.72 cm^3=117,809.72mL$

$1 cm^3=1 mL$

1 mL = 0.001 L

117,809.72 mL = 117,80972 L ≈ 118 L

Pressure of the gas in vessel = P = 7.40 MPa = $7.40\times 10^6 Pa$

$1 MPa = 10^6 Pa$

1 atm = 101325 Pa

$P=\frac{7.40\times 10^6}{101325} atm=73.0 atm$

Mass sulfur hexafluoride gas = 19.2 kg = 19200 g

1 kg = 1000 g

Moles of sulfur hexafluoirde = $\frac{19200 g}{146 g/mol}=131.5 mol$

Temperature of the gas in vessel = T

Using an ideal gas equation :

$PV=nRT$

$T=\frac{PV}{nR}=\frac{73.0 atm\times 118 L}{0.0821 atm L/mol K\times 131.5 mol}$

T = 797.8 ≈ K 798 K

T = 798 - 273°C = 525°C

525°C is the maximum safe operating temperature the engineer should recommend for this reaction.

3 0

3 years ago